mackey



(No ModeL) J. G. MAGKEY.

THBRMOTIG CIRCUIT CLOSER.

No. 366,176. Patented July 5, 1887.

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g Y 314004110; -MQL Md A M UNITED STATES PATENT OFFICE.

JOHN C. MAOKEY, OF PHCENIX, NEYV YORK.

THERMOT IC CIRCUIT-CLOSER.

SPECIPICATICSN forming part of Letters Patent No. 366,176, dated July 5, 1887.

Application filed August I2, 1886. Serial No. 210,63. (No model.)

T all whom, it may concern.-

Be it known that 1, JOHN G. MAOKEY, a citizen of the United States, residing at the village of Phoenix, county of Oswego,and State of New York, have invented certain new and useful Improvements in Thermostats,of which the following is a specification, reference being. bad to r the accompanying drawings, and to letters and figures of reference marked thereon,which form a part of this specification.

My invention relates to a thermostat constructed with an open circuit closed by heat acting upon a soldered joint or catch, or a pin, and thereby releasing a drop and pin, or connecting-pin, which operates either entirely by gravity alone to make the connection or a spring can be used bearing against the pin, in

which case the pin can operate either vertically or horizontally,-together with two connectingpoints, the whole being inclosed in a supporting box or body, which is secured to the wall or ceiling and is provided with suitablc poles and non-conductors; and the object of my invention is to provide a thermostat constructed with a receiving cup or chamber, inclosing-points with positive and negative connecting electrical lines, and a weighted connecting drop pin or bolt,which may be assisted in its action bya spring held in position when the circuit is open by a supporting plate or catch attached to the thermostat by fusible solder and operating to close the circuitwhen the fusion of the solder releases the supporting-plate, by the falling of the drop-bolt upon the two connecting-points.

Similar letters and figures of reference refer to like parts throughout the several figures.

I accomplish the above-described result by a thermostat constructed substantially as shown and described in the accompanying drawings, in which- Figure l is a side elevation of my thermostat, showing the body attached to a ceiling and the thimble or capF screwed over the threaded shank of the body A, while the support-ingplate K is attached, as is shown. It also shows the projecting heads of connecting-screws O and D and the manner of attaching the elec trodes G and H to the screws.

Fig. 2 is a vertical section of my thermostat, showing the arrangement of the several parts when the circuit is open. A is the body of the thermostat, having counter-flange 1, through which screws X X are inserted to hold the spring I in its place and to secure my thermostat to the ceiling. The hole 2 2 passes entirely through the body of my thermostat, but is countersunk at the top into a cup-shaped cham her, 3 3, into which are received the points 10 and 11 of the conneetingscrews Oand D. This chamber also contains the connecting drop bolt B in such a manner that it will be supported by the plate or catch K. When the circuitis open, as is shown here, entirely disconnected from the points 10 and 11, this body is provided with holes tand 5, through which connecting-screws (J and D are inserted, and with a threaded shank, 6, upon which I place the cap or'thimble F, which is constructed with an opening at the bottom, corresponding in size with hole 2 in shank of the body A, through which the lower end ofstem 9 of the drop-bolt B will pass upon the supporting plate or catch K being taken away. This cap or thimble F is threaded, so that it will screw firmly upon shank 6 and form a shoulder, as shown in Fig. 1. B is the drop bolt of my thermostat, constructed, substantially as shown in the draw ings, with a weighted globular-shaped head,

8, having a fiat top against which the spring I will press, andalso havingastem, 9, which passes through the hole 2 in the body of the thermostat and rests upon the supporting plate or catch K. The head and stem of the drop-bolt are weighted, to give it greater velocity in falling to close the circuit. C and D are connecting-screws with projecting heads. They are inserted from the outside through the body of the thermostat, in holes 4 and 5, in such a manner that the points 10 and 11 are within the chamber 3 3, so that they will come into direct contact with the under surface of head 8 of the drop-bolt B when it falls downward upon fusion of the solder at joints 12 and 13, releasing the supporting-points. Upon the heads of these screws I place, as shown in the drawings, the connecting-wires G and H, which are the electrodes of one or more batteries, and may also connect with any number of similar thermostats 011 the same circuit. The supporting plate or catch K correspondsin shape and size to the bottom of cap F, and closes the opening at the bottom of the cap by being soldered upon it at the joints 12 and 13 by a solder which fuses at a given temperature. Its office is to support the weight of drop-bolt B when the circuit is open. The plate K being soldered upon the end of cap F, it supports the drop-bolt B, as shown in Fig. 2. The electrodes G and H being secured to the screws 0 and D, the thermostat is in readiness for operation. Then the action of heat on supporting-plate K, at joints 12 and 13, fuses the solder which attaches K to the cap F, and as the solder fuses it loses its power of adhesion, and allows supporting plate or catch K to become detached from cap F and to fall off. The support of bolt 13 having been thus removed, the drop-bolt, by force of gravity, (which action may be accelerated by use of the spring, as shown in the drawings,) falls downward until the under surface of the head 8 of the d rep-bolt strikes upon the points and 11 ot' the two connecting screws 0 and D, which then arrest its fall and hold it in suspension, as is shown in Fig. 3, which represents the dropbolt 13 as having fallen down upon the points 10 and 11 of the screws 0 and D, and the supporting-plate K detached from the cap or thimble F. As the bolt B is constructed of conducting material, it acts, after having fallen down, as a connector for the electrodes and closes the electrical circuit upon contact with the points 10 and 11.

Fig. 4 is an inverted view of Fig. 1, showing the counter-flange l, with screw-holes X X for attaching it to the ceiling or wall, the connecting-screws C and D, the electric wires G and II, attached to the connecting-screws, and the cap F, with the plate K soldered upon it.

Fig. 5 is an inverted view of the cap F, showing the hole through which the stem of the drop-bolt passes in falling.

Fig. 6 is an inverted view of the supportingplate K detached from the cap F.

Fig. 7 shows a side elevation of the dropbolt 13 and the details of its construction. For illustration, I may designate wire G- as my battery-wire, and wire H as the wire leading to alarm or other devices operating through my thermostat.

My thermostat may be constructed either with or without the spring I. The oflice of this spring is to accelerate the action of. the drop-bolt 15, which will fall of its own weight when the thermostat is operating vertically; and when it is desirable to operate the thcrmostat horizontally, the spring will force the drop-bolt upon the connecting-points. \Vhen thus constructed, my thermostat may be used for the purpose of giving an alarm in case of fire, or in operating an automatic electrically opening valve, and for other purposes of a thermostat.

Having described my invention, whatI claim, and desire to secure by Letters Patent, is-

1. In a thermostat, a body containing a countersunk 'rcceivingchamber, and having a connecting hollow shank threaded to receive an open thimble or cap, provided with aspring operating an automatic dropbolt, in combina tion with heat-releasing supporting-plate and electrical supporting-points, constructed substantiall y as shown and described.

2. In a thermostat, a connecting dropbolt provided with weighted head and body, to gether with a stem, in combination with a spring, a supporting-plate secured to the thermostat upon its cap by fusible solder on a heatreleasing joint, and electrically connected points, contacting with the drop-bolt, coir structed substantially as shown and described.

In witness whereof I have hereunto set my hand this 31st day of July, 1886.

JOHN G. MAGKEY.

\Vi t n csses:

Gno. F. IIINn, FRANK L. S'rEVn'Ns. 

